In the midst of an exciting football game this past fall, I broke the the rear base screw on my Rem 700 Ti. Thought I had just wrenched on it too hard and took it to a gunsmith. Result...he fixed it but also told me that the hole had not been tapped completely, i.e., I had run out of threads... so he retapped all...still the 6x48's...just some info for you to mention to the smith or machinist...might save problems in the future.